An output buffer circuit of a Pseudo Emitter Coupled Logic uses a common level which is generated by a resistance division so that the common level is unstable to follow to a gradient of power source variation and an output signal level of the output buffer circuit is apt to be off from a level of the PECL. The surface acoustic wave device has an unbalanced-to-balanced conversion function as a result of the phase of the second resonator filter being reversed by 180 with respect to that of the first resonator filter. A second selectively deactivatable cylinder group 14 is also provided. The distinct timing paths have timing violations. In a salvaging operation, a diver may temporarily secure the ring to a structure sunk to, for example the sea floor, the diver may disengage the hook members from the arc member, and finally, the weights are rested on the sea floor and the float ball and the structure together move upward until the float ball reaches the surface of the sea due to buoyancy of the float ball. In addition, system and methods are provided that can recognize registered users within a set proximity to the machine and broadcast messages and notifications such as machine information, inventory information, rewards, discounts and free products, all of which could be tailored to the specific user based on understanding gathered through analysis of prior interactions.